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Studies were carried out on seven taxa from beardless (Limniris) section: grassy leaved iris (Iris graminea L.), yellow iris (I. pseudacorus) and Siberian iris (I. sibirica L.), as well as hybrids from Sibiriceae section: I. 'Dreaming Yellow', I. 'Towanda Redflare', I. 'Violet Meer' and I. 'Wiltrud Gissel'. The following parameters were assessed: flower size, the length and width of stamens, the length of pistil, the color of: flower petals, pistil, stamen and pollen. It is considered that tetraploids have twice bigger flowers. The investigations confirmed this opinion. Iris 'Dreaming Yellow', which is tetraploid, has twice bigger individual elements of perianth than diploid taxons. Determining the sizes of individual elements of parental plants' perianth allowed to formulate a standard. It will serve for comparing morphological features of hybrids obtained in future. The identification of colour by means of Royal Horticultural Society Colour Chart occured not enough precise.

Key words:
beardless iris, flower size, petals, pistil, color.

Magdalena KuligDepartment of Dendrology and Landscape Architecture, University of Agriculture in Krakow

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